Final answer:
Kevin's behavior of giving all his employees a rating of 2.5 out of 5 without differentiating between good and poor performers is an example of leniency error.
Step-by-step explanation:
Kevin's behavior of giving all his employees a rating of 2.5 out of 5 without differentiating between good and poor performers is an example of leniency error. Leniency error occurs when a rater evaluates all employees in a positive or neutral manner, without providing distinctions. By doing so, Kevin is not accurately assessing his employees' performance, which can have negative consequences for the organization.